Can YOU solve TikTok ‘quick maths’ puzzle in 20 seconds? Take the challenge now

MATHS nerds look out, there's a puzzle that'll pique your interest doing the rounds.
And you'll either be left scratching your head - or figure it out real quick.
But can you solve it in 20 seconds?
That's the challenge set by TikToker who shared the brainteaser.
The video shows three sums, with a fourth left for you to figure out.
But don't be fooled by the addition symbols...
The first seems pretty innocent, with 2 + 4 = 6.
But the next goes off, with 3 +5 = 12.
The final clue is 4 + 6 = 20.
So what is 9 + 11?
If you're thinking 20, you're wrong.
Despite the trick in the first sum, it's not 2 plus 4, it's actually 2 multiplied by 4 minus 2... which also gives 6.
And the same pattern is continued with the others.
This means 9 + 11 is... 90.
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